Code Monkey DS is a full feature text editor/Lua IDE for the Nintendo DS. Made using MicroLua, its features include:

Save/SaveAs, Load, Home, End, Goto
Find/Replace*, Copy/Cut/Paste*, Delete, Undo/Redo/Repeat*
Custom Tab Sizing
Auto-Indent*
Auto-Backup*
Word Completion*
Lua Code Completion*
Lua Syntax Coloring
Custom Color Schemes
Running Lua Scripts
2 Keyboard Modes*
Open/Edit multiple files at once
(* signifies that the features is still buggy or under developement)

Future plans for improvements:

Add syntax coloring and code completion for html, c#, java, and d
Add document mode for writting word like documents
Allow minimizing go shell
Add version checking and bug reporting